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事情的起因源于某个人说液体密度测量得到的是无大气压状态,如果要得到一个大气压下的密度,要用大气压下空气的密度(0.0012)校正,这个说法我第一次听说,为了寻求答案,我翻了密度测量标准和仪器操作说明,研究了比重瓶法、韦氏天平法和振荡管法,得到一些结论,仅代表个人看法,有兴趣的可以共同商讨。1.这种说法不对的,液体密度的定义只提到温度,不考虑大气压。2.在比重瓶法中用到空气密度,是因为它是通过测物体表观质量计算密度的,表观质量是实际质量和空气浮力之差,即等于(物体密度-空气密度)X体积。这是方法决定的,和大气压无关。
如何测量悬浮液中颗粒的质量密度,目前悬浮液中颗粒总重已经可得,只是悬浮颗粒的总体积无法得知
氢氧化钠溶液的浓度、溶质的质量分数和密度密度 (20℃ ) NaOH的质量分数g/cm3 (g/100g溶液) 物质的量浓度 (mol/L) 1.000 0.159 0.03931.005 0.602 0.1511.010 1.045 0.2641.015 1.49 0.3781.020 1.94 0.4941.025 2.39 0.6111.030 2.84 0.7311.035 3.29 0.8511.040 3.745 0.9711.045 4.20 1.0971.050 4.655 1.2221.055 5.11 1.3471.060 5.56 1.4741.065 6.02 1.6021.070 6.47 1.7311.075 6.93 1.8621.080 7.38 1.9921.085 7.83 2.1231.090 8.28 2.2571.095 8.74 2.3911.100 9.19 2.5271.105 9.645 2.6641.110 10.10 2.8021.115 10.555 2.9421.120 11.01 3.0821.125 11.46 3.2241.130 11.92 3.3671.135 12.37 3.5101.140 12.83 3.6551.145 13.28 3.8011.150 13.73 3.9471.155 14.18 4.0951.160 14.64 4.2441.165 15.09 4.3951.170 15.54 4.5451.175 15.99 4.6971.180 16.44 4.8501.185 16.89 5.0041.190 17.345 5.1601.195 17.80 5.3171.200 18.255 5.4761.205 18.71 5.6361.210 19.16 5.7961.215 19.62 5.9581.220 20.07 6.1221.225 20.53 6.2861.230 20.98 6.4511.235 21.44 6.6191.240 21.90 6.7881.245 22.30 6.9581.250 22.82 7.1291.255 23.275 7.3021.260 23.73 7.4751.265 24.19 7.6501.270 24.645 7.8241.275 25.10 8.0001.280 25.56 8.1781.285 26.02 8.3571.290 26.48 8.05391.295 26.94 8.7221.300 27.41 8.9061.305 27.87 9.0921.310 28.33 9.2781.315 28.80 9.4661.320 29.26 9.6561.325 29.73 9.8471.330 30.20 10.041.335 30.67 10.231.340 31.14 10.431.345 31.62 10.631.350 32.10 10.831.355 32.58 11.031.360 33.06 11.241.365 33.54 11.451.370 34.03 11.651.375 34.52 11.861.380 35.01 12.081.385 35.50 12.291.390 36.00 12.511.395 36.495 12.731.400 36.99 12.951.405 37.49 13.171.410 37.99 13.301.415 38.49 13.611.420 38.99 13.841.425 39.495 14.071.430 40.00 14.301.435 40.515 14.531.440 41.03 14.771.445 41.55 15.011.450 42.07 15.251.455 42.59 15.491.460 43.12 15.741.465 43.64 15.981.470 44.17 16.231.475 44.695 16.481.480 45.22 16.731.485 45.75 16.981.490 46.27 17.281.495 46.80 17.491.500 47.23 17.751.505 47.85 18.001.510 48.88 18.201.515 48.905 18.521.520 49.44 18.781.525 49.97 19.051.530 50.50 19.31